Note: The Mitsubishi Lancer was discontinued in 2017, so a 2020 model would not exist. The TC-SST (Twin Clutch Sportronic Shift Transmission) was available in the Lancer Evolution and Ralliart models. This content addresses TC-SST failures in applicable Lancer variants.
TC-SST Overview
Mitsubishi's TC-SST was a wet dual-clutch transmission designed for performance. Used in the Lancer Evolution X and Ralliart models, it provided quick shifts through two clutch packs. The transmission was sophisticated for its era but developed reliability concerns, particularly in high-performance applications.
Common TC-SST Failures
The TC-SST experiences several failure modes. Clutch pack wear from aggressive driving causes slipping and shudder. Mechatronic unit failures create shifting problems or complete loss of function. Hydraulic pump failures prevent proper clutch actuation. The P0700 code indicates a general transmission malfunction requiring deeper diagnosis.
Warning Signs of Failure
TC-SST failure often progresses through stages. Early warnings include longer shift times, increased shift harshness, and occasional slip during hard acceleration. As problems worsen, the transmission may get stuck in gear, refuse to shift, or enter limp mode. Complete failure results in no drive capability.
Repair Considerations
TC-SST repairs are expensive due to limited parts availability and specialized knowledge required. Complete transmission replacement may cost $5,000-$8,000 or more. Rebuilding services exist but quality varies. For vehicles with high mileage or repeated failures, conversion to manual transmission is sometimes considered.